22213237 has 4 divisors (see below), whose sum is σ = 23519916. Its totient is φ = 20906560.

The previous prime is 22213183. The next prime is 22213259. The reversal of 22213237 is 73231222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73231222 = 2 ⋅36615611.

It can be written as a sum of positive squares in 2 ways, for example, as 12916836 + 9296401 = 3594^2 + 3049^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22213237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22213537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 653314 + ... + 653347.

It is an arithmetic number, because the mean of its divisors is an integer number (5879979).

Almost surely, 2^22213237 is an apocalyptic number.

It is an amenable number.

22213237 is a deficient number, since it is larger than the sum of its proper divisors (1306679).

22213237 is a wasteful number, since it uses less digits than its factorization.

22213237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1306678.

The product of its digits is 1008, while the sum is 22.

The square root of 22213237 is about 4713.0920848207. The cubic root of 22213237 is about 281.1063245094.

Adding to 22213237 its reverse (73231222), we get a palindrome (95444459).

The spelling of 22213237 in words is "twenty-two million, two hundred thirteen thousand, two hundred thirty-seven".